The temporomandibular joint (TMJ) connects the lower jaw to the skull. You can feel your two TM joints and their movement by placing your fingers directly in front of your ears and opening your mouth.

From enjoying the great outdoors to playing sports safely, here's how to protect yourself and deal with emergencies.

What Is the Heart and What Does It Do? The heart is an organ that’s a pump, usually beating about 60 to 100 times per minute. With each heartbeat, the heart sends blood throughout your body, carrying ...

Everybody knows that some organs in the human body are necessary for survival: you need your brain, your heart, your lungs, your kidneys... KIDNEYS? Absolutely. Even though you won't find a ...

We see and hear about hearts everywhere. A long time ago, people even thought that their emotions came from their hearts, maybe because the heart beats faster when a person is scared or excited. Now ...

What Are the Spleen and Lymphatic System? The spleen is located in the upper left part of the belly under the ribcage. It helps protect the body by clearing worn-out red blood cells and other foreign ...

Fainting (or "passing out") is a temporary loss of consciousness that usually happens because not enough blood is going to the brain due to a drop in blood pressure. Blood pressure can drop from ...

How much do you know about your brain? Find out by taking this quiz!

Usually, diaper rash is the result of an irritation, infection, or allergy. Also, starting new foods can change the content and frequency of a baby's poop, which can sometimes lead to a diaper rash.

What Is the Respiratory System? When we breathe, the respiratory system takes in oxygen and sends out carbon dioxide. The cells in our bodies need fresh oxygen to stay alive. As cells do their jobs, ...

What's the Urinary System? And What's Pee? You drink, you pee. But urine is more than just that drink you had a few hours ago. If you've ever wondered where pee comes from, this movie has the answers!

How Does the Brain Work? And How Does the Nervous System Work? How do you remember the way to your friend's house? Why do your eyes blink without you ever thinking about it? Where do dreams come from?